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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd00d658ea6047dc28b2251bd7f91a509b597b49deb0fe77f5159617df17c3c' 
  AND token = 'a31AIw/bMGNdZqwBii2LyTl4hEJYTTI+Z3ZIcRH/prw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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