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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e017b1a65f9c1a393c0510ddc2fcda6303d0ca61f9b33af23e0168ea172045' 
  AND token = '9kG5Th2mIdh1eSxRnivJ0gGZFPFQ168R/b2i51mX+yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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