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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9755012420f09cda3102c6f7c9e41abe59a82bb0e828a04416f24f1730eeaa7' 
  AND token = 'x9RSVhR4fw40B2aw9i3kLHCR+vvERhS6/XTXX2IfVPI=' 
  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"
    }
  }
}