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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b06ec35c12f977a4331cce98b49203fa723ebb3cafbc32a848696503f80d08' 
  AND token = 'TRpDh53CIZyGmFiliJOoh0y5/9cBx46ynAcwaeUVMWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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