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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0859fabcce048614edbbd640e051e2f876a4cdcf2a5a0137defcb107bd592020' 
  AND token = '8bn+h+19aDygx3FW7C7x1KpDRQMgXFidBJAkkAK1S5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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