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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4150392670c497bb6561658152fd95a94e91c96cb0f3f0b6e2e7f5fd8f8922b5' 
  AND token = 'LZ9ngToBJ32VLjOll/apo4+p4rPAe2zDVOyL09/7Le0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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