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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c8cae0fccf7596cc9385506dbbb955f16eb76cd62f41c9e7cfc5d6c1b25b5e' 
  AND token = 'E46qkA28D/1N9zxfpassUg/Bjm0Il2rHsbLEXbODMBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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