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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db8aeda856b77ffb2057f0015e0f60f760e1c9b3f6316f5ca6b7930022435e2' 
  AND token = '7v/BBk/o9oLbNcYSV4+ywW03HHR9t5D8aerjgLT1UXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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