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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a03c2303e833a1ac66aab33f571f6b33815cafc1b0913dba2d4f80d0d60d2b' 
  AND token = 'TJDSTbVmg5AOU43VI3mEUNWv8mxoQey85LzQxi4imjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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