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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f806ad96727b9de32a2c07050216df23f86f3f7ac5bfaf74fed7d36b71e43930' 
  AND token = 'aCNtVyyTR/nbHB+gUOMl/LY2jdlhOvR79RyUlV9/DJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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