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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4343b203249e87d72a04b066a624ace2e02ba4418225d864e6aebac9b5c7d8' 
  AND token = 'yhPLzD6QqoDQsGHrtFMc2q3ByfHIzbsKeJKWzb8fEVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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