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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58aeb0f2ab19c926cf2cb0c749c613fd1139c33092d765c078904b8a83854723' 
  AND token = '5Vdw2Z32wWLBb0xHDL4Yp7236kbdW66o1qRdHO7TN8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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