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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0be44f53098111ce2c5138ef333f07f061dfb07db763b12f94ce3fb22fdf263' 
  AND token = 'ejZBowaFJM0og+6LgnpPdoyk+J3wAflcKQSI2bI+PeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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