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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18342635cb50a28c8a524f5403d6d7756fd4539cbf666d3c801b7a73c1dab9fd' 
  AND token = 'EK0zzhl93mviyAuUulA76RUCNM9/05yBo/NSOz3Z0dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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