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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba145da881a549b6563b9d447d7ecc4ecc0a2ebf87c44a782695594040d2b7c3' 
  AND token = 'vV7NvI5XBOLbWW1x5Qw27gVO8R/hIW09vmXC8QgqsHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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