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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00920b0b79f820d980cc55a792d2fbf11f00f6346af27a907dae6ead1d1e4cdf' 
  AND token = 'X1PxOcfS4ub0NhQ263xNuC+g8ErjKcVvqUxeyGSFWP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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