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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409b7f32b0deecdadb41c969a51f60690c86f798499b2be1ec16ab4c07263a10' 
  AND token = 'h54kQSal76GHlTl/ujROsZRR1mSxL40bWz0Wn8zgKQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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