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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5c759bf284569a93000ea47f5f54f3f0cc52eb7501a9d9c2b4ac45063b3fc8' 
  AND token = '4WeTp2Z5Srt6toXYqD3tGpHYFh6mv+yhvfHtPe/C2fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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