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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b85b4fdc5d8a2c642765d56abe5d64666471baca6e0488e0892605860d12293' 
  AND token = 'OwLcqaXYuG12vm9YnfcNLkGE/BCBIi2uKhVrN9QxSkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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