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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5645fcfa987dd9f4728ea2f28ed42a9afa4717b3db40375b16eb41401e9597' 
  AND token = '4lGZnC/6Ukp1tMGC4b0O7nI1ePkQWfxkP20n4j8E6nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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