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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e690193347cbb813aa4494a22a799867b2ed8ec87de16a0e93bbb35411c7892c' 
  AND token = 'hJ3d6TTO25XQlyZ4F49rlRWvqfUEcxBB1f21wQuhF6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}