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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c2b767059ebf453c03ab13ca6f1be1f81d647d0d9872a14d083a31e66382bd' 
  AND token = '0ypLovAcwQm9jqUxcD00K+sKBGX34BEmro0/ORf3UhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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