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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a88a5039fbf5d9b0dafedbd6fe7a689c2db8dad172ca8bd1bccb533c707c9de' 
  AND token = 'OFEnzzmwN3sw85Jqu72/xXI3LKHzQU1DfIQ01kOX6EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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