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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c4e1fecb7c01ba6ceb45e3bb230a9153f08761654574b94492e3ee713e10de' 
  AND token = 'Qhex6uqegKhhK1W3jB9mW1GrPFHCAHu5GmJ9ByWxwsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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