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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9898e570f544519f89f2074638924bde390d2aa2db135ef6793b3a0bd05c40' 
  AND token = '/0yNQo/qfejozuO3rQf7WrUXP8j26k3ghGPbtmbZePI=' 
  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"
    }
  }
}