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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d32a00f68da935ec189bf3b335225a9cd530a0a07d6c66b51746d7978ead36a' 
  AND token = 'Ml8oVU/T/BrR+65n/MiTBhyx3d1GDBnzTvFeNjbrW8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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