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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e9fac9b5bfbb2c742701b1f35624659880c24faebfdea0be97b9a715471d2f' 
  AND token = 'f4qM7C0YReVLrgNlDW9RkKB6H2CSFKo6QNJVJChvfPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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