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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dff7748d3ebc6f5bcd2b0cb432ea9a1bf5876beda2ed0acbf511a9a68411fa1' 
  AND token = 'abMlkxVyONbL2cRwBeE8+V9fn8L2a0owCHA74I7eht4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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