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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1e37a21477d52303855c49dd2075be0379a15d4f8fd5b43283db72e2725bee' 
  AND token = 'UKYphPGLb8rwL7dDwvL1GvJmFm+Dh9zu/4tOF5o7WE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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