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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea0893c8900348d5ac93463a6de4522a9531495326d9c5ff3b8f7554e6bb181' 
  AND token = '+syXN9QumcqwEo77yMUVfEhuU9L3mGGnVo1M44BNShc=' 
  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"
    }
  }
}