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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56588cc7507afb8a36773f454729d00afd7fa1471d06ebe3f2d036249c6b3f71' 
  AND token = '6RiPKXAGS0IYKurPL6VY273lh8AsfcwmLO3f5mYJdDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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