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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bd55c14a65147db99943d1b628d669c42fdf1c6f4421c9b6ad47bbe7fafd95' 
  AND token = 'GHk3KL8HyjkZ0ucvYyp2M6her9Us8ApPfQLHCTjiFQ4=' 
  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"
    }
  }
}