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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeeda702886a73167556e012a8391e62fa824c2daab448a7fdf3411e3670f3af' 
  AND token = '0oJo93i/uEp5gDELH7oxP+pyRwoCi4ZKddPD96JhaQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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