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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530e1bf14452edc85c932d63899bc9d82bba5704365ad0e0fc8853cea36dafc2' 
  AND token = '9TWvxF0du4LO7aoLPfxC5etKZm4uTyA27Ae+2VG862A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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