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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf17661a3d1e9b3a033e3422a4f5eff6d69e901fedaaf28d211fcf5252d5f2ee' 
  AND token = '+mvP/VMjbfrodBmEOhkTrQ7vC3xbB7drSwLzplqcqyg=' 
  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"
    }
  }
}