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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52236fd200a84072a367fcb996c1375414dba97fc312ce4cbe2a391f90aff3c0' 
  AND token = 'alVOu0ptBRFey1CwtXG9GwRFNag5z/ZQOqI1b2TWLFw=' 
  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"
    }
  }
}