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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc06ef1c475c771953b6f6b2427a9308316ae49fdc06d1f6944d383d508ccfc' 
  AND token = 'Ah8v3sdXiLxn8Ht+uCEICALNl5xdGhmUcpzMnTRJnBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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