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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2073426eb66a81f718c2aabdc12f4621e783f75b2d28f60d33cd09b02a1f44a2' 
  AND token = 'KN/nC/JjPFU9Pn1D13JlkyeoWYMND2/SgDzI0ykQgNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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