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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6903278a0a06a6db4ae7cf31ecb5ce9d6198de29c6f9d50844fc32e679a7a003' 
  AND token = 'SC7k8qcuYARsQ2tGugipZ8IfJwf7lLTs3R8gdDl8/EQ=' 
  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"
    }
  }
}