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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95de2dc99bfecd2d5db94abbe33f40494a2d85d86d29ce0d13dc00acffa919ce' 
  AND token = 'htrAFV80aAO92JKhgR8PzmG2gqxQ+KQG3r0yDdemwBI=' 
  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"
    }
  }
}