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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f1488ce983f28f2538161fc5142df8092334ec174c18e6776ee695b8c703f2' 
  AND token = '6AVs1HSebBwInP+DV5peXIG18aCb/0Gz1RsIwJs89Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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