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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbca191ec5c822eab85bb22ab0eb50aeb160ea191ce33395a9db1a3a64df2c8b' 
  AND token = 'upEH/7kPj1cah7mMuQcT3OhmZzQQ0CYnsggOhe2fBhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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